not many spinners are on the level of murali and warne, strike rates of under 60 in tests as spinners, not many can compare to that. saeed ajmal is potentially a great, his first few test matches weren't so good but since then he's been right up there, swann over 44 matches still has a strike rate of under 60 so he's up there to, and herath has been fairly decent to since murali's retirement.